import Vue from 'vue'
import Router from 'vue-router'
import { isURL } from '@/utils/validate'

Vue.use(Router)

// 解决ElementUI导航栏中的vue-router在3.0版本以上重复点菜单报错问题
/* const originalPush = Router.prototype.push
Router.prototype.push = function push (location) {
  return originalPush.call(this, location).catch(err => err)
} */
// 缓存原型上的push函数
const originPush = Router.prototype.push
const originReplace = Router.prototype.replace
// 给原型对象上的push指定新函数函数
Router.prototype.push = function (location, onComplete, onAbort) {
  // 判断如果没有指定回调函数, 通过call调用源函数并使用catch来处理错误
  if (onComplete === undefined && onAbort === undefined) {
    return originPush.call(this, location, onComplete, onAbort).catch(() => {})
  } else { // 如果有指定任意回调函数, 通过call调用源push函数处理
    originPush.call(this, location, onComplete, onAbort)
  }
}
// replace同理处理
Router.prototype.replace = function (location, onComplete, onAbort) {
  if (onComplete === undefined && onAbort === undefined) {
    return originReplace.call(this, location, onComplete, onAbort).catch(() => {})
  } else {
    originReplace.call(this, location, onComplete, onAbort)
  }
}

// 页面路由(独立页面)
export const pageRoutes = [
  {
    path: '/404',
    component: () => import('@/views/pages/404'),
    name: '404',
    meta: { title: '404未找到' },
    beforeEnter (to, from, next) {
      // 拦截处理特殊业务场景
      // 如果, 重定向路由包含__双下划线, 为临时添加路由
      if (/__.*/.test(to.redirectedFrom)) {
        return next(to.redirectedFrom.replace(/__.*/, ''))
      }
      next()
    }
  },
  { path: '/login', component: () => import('@/views/pages/login'), name: 'login', meta: { title: '登录' } },
  { path: '/share', component: () => import('@/views/pages/share'), name: 'share', meta: { title: '分享' } }
]

// 模块路由(基于主入口布局页面)
export const moduleRoutes = {
  path: '/',
  component: () => import('@/views/main'),
  name: 'main',
  redirect: { name: 'home' },
  meta: { title: '主入口布局' },
  children: [
    { path: '/home', component: () => import('@/views/modules/home'), name: 'home', meta: { title: '首页', isTab: true } }
  ]
}

export function addDynamicRoute (routeParams, router) {
  // 组装路由名称, 并判断是否已添加, 如是: 则直接跳转
  var routeName = routeParams.routeName
  var dynamicRoute = window.SITE_CONFIG.dynamicRoutes.filter(item => item.name === routeName)[0]
  if (dynamicRoute) {
    return router.push({ name: routeName, params: routeParams.params })
  }
  // 否则: 添加并全局变量保存, 再跳转
  dynamicRoute = {
    path: routeName,
    component: () => import(`@/views/modules/${routeParams.path}`),
    name: routeName,
    meta: {
      ...window.SITE_CONFIG.contentTabDefault,
      menuId: routeParams.menuId,
      title: `${routeParams.title}`
    }
  }
  router.addRoutes([
    {
      ...moduleRoutes,
      name: `main-dynamic__${dynamicRoute.name}`,
      children: [dynamicRoute]
    }
  ])
  window.SITE_CONFIG.dynamicRoutes.push(dynamicRoute)
  router.push({ name: dynamicRoute.name, params: routeParams.params })
}

const router = new Router({
  mode: 'hash',
  scrollBehavior: () => ({ y: 0 }),
  routes: pageRoutes.concat(moduleRoutes)
})

router.beforeEach((to, from, next) => {
  // 添加动态(菜单)路由
  // 已添加或者当前路由为页面路由, 可直接访问
  if (window.SITE_CONFIG.dynamicMenuRoutesHasAdded || fnCurrentRouteIsPageRoute(to, pageRoutes)) {
    return next()
  }
  fnAddDynamicMenuRoutes(window.SITE_CONFIG.menuList)
  next({ ...to, replace: true })
  // 获取菜单列表, 添加并全局变量保存
  /* http.get('/sys/menu/nav').then(({ data: res }) => {
    if (res.code !== 0) {
      Vue.prototype.$message.error(res.msg)
      return next({ name: 'login' })
    }
    window.SITE_CONFIG['menuList'] = res.data
    fnAddDynamicMenuRoutes(window.SITE_CONFIG['menuList'])
    next({ ...to, replace: true })
  }).catch(() => {
    next({ name: 'login' })
  }) */
})

/**
 * 判断当前路由是否为页面路由
 * @param {*} route 当前路由
 * @param {*} pageRoutes 页面路由
 */
function fnCurrentRouteIsPageRoute (route, pageRoutes = []) {
  var temp = []
  for (var i = 0; i < pageRoutes.length; i++) {
    if (route.path === pageRoutes[i].path) {
      return true
    }
    if (pageRoutes[i].children && pageRoutes[i].children.length >= 1) {
      temp = temp.concat(pageRoutes[i].children)
    }
  }
  return temp.length >= 1 ? fnCurrentRouteIsPageRoute(route, temp) : false
}

/**
 * 添加动态(菜单)路由
 * @param {*} menuList 菜单列表
 * @param {*} routes 递归创建的动态(菜单)路由
 */
function fnAddDynamicMenuRoutes (menuList = [], routes = []) {
  var temp = []
  for (var i = 0; i < menuList.length; i++) {
    if (menuList[i].children && menuList[i].children.length >= 1) {
      temp = temp.concat(menuList[i].children)
      continue
    }
    // 组装路由
    var route = {
      path: '',
      component: null,
      name: '',
      meta: {
        ...window.SITE_CONFIG.contentTabDefault,
        menuId: menuList[i].id,
        title: menuList[i].name
      }
    }
    // eslint-disable-next-line
    let URL = (menuList[i].url || '').replace(/{{([^}}]+)?}}/g, (s1, s2) => eval(s2)) // URL支持{{ window.xxx }}占位符变量
    if (isURL(URL)) {
      route.path = URL
    } else {
      URL = URL.replace(/^\//, '').replace(/_/g, '-')
      route.path = route.name = URL.replace(/\//g, '-') + (menuList[i].id || '')
      route.component = () => import(`@/views/modules/${URL}`)
    }
    routes.push(route)
  }
  if (temp.length >= 1) {
    return fnAddDynamicMenuRoutes(temp, routes)
  }

  // 组装路由
  routes.push({
    path: 'sys/user',
    component: () => import('@/views/modules/sys/user'),
    name: 'sys/user',
    meta: {
      ...window.SITE_CONFIG.contentTabDefault,
      menuId: 'sys-user',
      title: '用户管理'
    }
  })
  routes.push({
    path: 'oss/oss-share',
    component: () => import('@/views/modules/oss/oss-share'),
    name: 'oss/oss-share',
    meta: {
      ...window.SITE_CONFIG.contentTabDefault,
      menuId: 'oss-oss-share',
      title: '分享列表'
    }
  })
  // 添加路由
  router.addRoutes([
    {
      ...moduleRoutes,
      name: 'main-dynamic-menu',
      children: routes
    },
    { path: '*', redirect: { name: '404' } }
  ])
  window.SITE_CONFIG.dynamicMenuRoutes = routes
  window.SITE_CONFIG.dynamicMenuRoutesHasAdded = true
}

export default router
